Ron's potato cannon

A coworker,
Ron Harding built this wonderful contraption called a potato cannon.
A basic potato cannon consists of various pieces of ABS piping bonded together, with
A chamber on the back to hold the combustible gasses, and a long and narrow
pipe as the barrel through which the projectile, usually a potato, is accelerated
at high speed.

Some of us at work collaborated in demolishing some pre production versions of
a soon to be obsoleted product that shall remain unnamed here. (This is to
keep people who are looking for info on the product from finding this web page)

Having pieces of electronic equipment that have caused us much grief to aim
a cannon at adds a whole new level of fun to playing with a black and noisy
contraption that goes kaboom!

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Aiming the cannon at the electronics!

Note the propane cylinder for fueling the cannon. The cannon is fired by
igniting the gas with a spark plug. Ron is using a barbecue lighter to
create the spark.

Note that the cannon at the time the shot was taken has already moved back by
about 30 cm on account of the recoil. From where we found it, I suspect the
object in the sky at the top center is the actual projectile.

This shot was not actually done with a potato. A rectangular
hardwood 'plug' was used, with shop towels balled up behind it to provide
a good seal. The blue haze at the impact point is most likely the shop towel.

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What was left of unnamed prototypes after two firings
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We continued to shoot at successively smaller pieces of the product. Gradually,
various surface mount electronic components became embedded in the hardwood
plug we used as a projectile. We didn't stop until each circuit board
was broken into at least two pieces - and the circuit boards in this product
are quite thick because of all the layers.

The hardwood plug also had the great advantage of being reusable, as we
had quickly exhausted our limited supply of potatoes.